The Grand Challengers Podcast Episode #66

A veteran’s three acts, the ability curve and reinventing the knife

Guest: Douglas Katz

July 7th, 2026

Overview

“If you designed a knife for a robot, it wouldn’t look like the linear knife that we have today.” With one sentence, Douglas Katz turns an object most of us never think about into a question worth an hour and a half of conversation. Why is a tool shaped by thousands of years of stabbing and survival still treated as the pinnacle of kitchen design? And what happens when you start from the body instead?

Douglas is a West Point graduate, a disabled US Army veteran and a lifelong inventor who tells his story in three acts. The first is the military, which he describes as a leadership lab built on character, autonomy and the expectation that you leave your team better than you found it. The second is corporate America, a long and often grim chapter where the same instincts that made him valuable were treated as liabilities. The third is the one he was always meant for. After injuries made cooking painful, he forged a new kind of blade from a circular saw blade in his own workshop, and the joy of using it set everything else in motion.

That blade became NULU, an adaptive kitchen knife inspired by the traditional Inuit ulu and built on a concept his team calls force transfer geometry. From the product grew a philosophy. Ability and disability, Douglas argues, are not a binary switch or an identity. They are task-based, and they sit on a curve that every one of us travels. We will all age into disability, so designing for it is not charity, it is foresight that serves everyone.

In this episode Peter and Douglas move from Aikido and the power of softness, through a clear 101 on barrier-free, accessible, universal, inclusive and adaptive design, to ADHD reframed as a feature set rather than a bug. They get into AI as an “infinite assistant”, why pattern recognition may be the skill that defines the next era, and a quiet story about a banjo that taught Douglas more about acceptance than any business book. It is honest, funny and genuinely reframing. Full resources and links are below.

Episode Teaser

Teaser caption…

Biography

“…We are all going to age into disability…”

Douglas Katz is a West Point graduate, a disabled US Army veteran and a lifelong inventor who describes his career in three acts. He served around nine years in the military, including a posting as an artillery officer at Fort Carson in Colorado, before leaving in the late 1990s for corporate America. Across more than two decades he worked in sectors including telecom and lending, picked up an MBA, and lived as what he calls a dreaming entrepreneur suffering in a corporate desert. The path that finally fit him began not with a business plan but with a personal problem. Upper body injuries and arthritis from his years of service made an ordinary kitchen knife painful to hold, and rather than give up cooking he set out to redesign the tool itself.

That redesign became NULU, the adaptive kitchen knife Douglas invented and brought to market, inspired by the traditional Inuit ulu and built around a concept his team trademarked as force transfer geometry. Through his innovation platform Redleg Innovation he now helps other inventors bring adaptive products to market, and he champions an “ability curve” model that treats ability and disability as task-based and fluid rather than fixed. He writes about leadership and ADHD on his Substack, Children of Chaos, holds a first-degree black belt in Aikido that he tested around the time of open heart surgery, and leads a team of more than fifty professionals, most of them veterans. You can find him at douglasmkatz.com and through NULU at nuluknives.com.

Quick Summary & Highlights

  • Why a kitchen knife designed “for a robot” would look nothing like the one in your drawer, and how that idea became the patent-pending NULU
  • The “ability curve”: ability and disability as task-based and fluid, not a binary switch, and why we will all age into it
  • A plain-English 101 on barrier-free, accessible, universal, inclusive and adaptive design
  • ADHD reframed as a feature set rather than a bug, and why the right environment changes the whole equation
  • AI as an “infinite assistant”, pattern recognition as the next core skill, and what stays uniquely human

Resources Related to the Episode

Martial arts and the Aikido thread

West Point, the military and leadership

Adaptive design and the “101” on design theory

  • Barrier-free design, the post-war movement (1950s Europe, Japan and the US) that responded to injured World War II and Korean War veterans by removing physical obstacles.
  • The first US accessibility standard, ANSI A117.1 (1961), which set out how to make buildings usable by people with disabilities.
  • The Architectural Barriers Act of 1968, the first US law requiring federally funded buildings to be accessible. Official source, US Access Board: https://www.access-board.gov/about/law/aba.html
  • Universal design, coined by architect Ronald L. Mace, and the Center for Universal Design he founded at NC State University in 1989: https://design.ncsu.edu/research/center-for-universal-design/
  • The 7 Principles of Universal Design (Center for Universal Design, 1997): https://projects.ncsu.edu/ncsu/design/cud/about_ud/udprinciplestext.htm
  • Inclusive design and adaptive design, the more recent framings Douglas prefers, where the product adapts to the user rather than the reverse.
  • The Ulu, the traditional Inuit knife whose handle-above-blade geometry inspired NULU: https://en.wikipedia.org/wiki/Ulu
  • Force transfer geometry and the ability curve are Douglas’s own concepts, developed at NULU. Both are explored on the NULU site above.
  • The mezzaluna, the Italian curved chopping blade Peter uses as a visual comparison: https://en.wikipedia.org/wiki/Mezzaluna
  • Abilities Expo, where NULU was unveiled and where Douglas discovered new user groups: https://www.abilities.com

AI, pattern recognition and the future

  • The Tony Stark and “Jarvis” analogy Douglas uses for AI as an “infinite assistant” (before Jarvis becomes the sentient Vision): https://en.wikipedia.org/wiki/J.A.R.V.I.S.
  • AARP and its AgeTech Collaborative, the accelerator and incubator for ageing technology Douglas cites: https://www.aarp.org
  • Tony Robbins, whose seminar prompted the discussion of pattern recognition as a key skill for an AI-powered future: https://www.tonyrobbins.com
  • The NULU Navigator, Douglas’s in-development AI agent for matching users to the right adaptive product (introduced through NULU, linked above).

Ideas, quotes and cultural references

  • “Everybody is a genius. But if you judge a fish by its ability to climb a tree, it will live its whole life believing that it is stupid.” Widely circulated and commonly attributed to Albert Einstein, though there is no reliable source for the attribution.
  • The Riddle of the Sphinx (four legs in the morning, two at midday, three in the evening), Douglas’s metaphor for the ability curve: https://en.wikipedia.org/wiki/Sphinx
  • “The true meaning of life is to plant trees, under whose shade you do not expect to sit.” A Greek proverb Douglas paraphrases when talking about legacy.
  • “Red Dawn” (1984), the film Douglas names as shorthand for the Reagan-era patriotism of his youth: https://en.wikipedia.org/wiki/Red_Dawn_(1984_film)
  • The NULU Kickstarter campaign (2024), which crowdfunded the knife ahead of its 2025 launch: https://www.kickstarter.com/projects/nulu/nulu-knife?ref=profile_created&category_id=28

Episode Chapters

(Chapters are embedded in the episode for quick access, click this to expand and view all chapters and time stamps)
  • 0:00 Intro
  • 1:59 Guest Intro & Aikido
  • 9:12 Douglas’ Story in Three Acts: The Military
  • 16:29 A precursor to the second Act – Leadership
  • 19:39 The second Act – Corporate America
  • 25:56 The third Act and Doug’s current innovation
  • 36:36 Reframing ability and disability and design for it
  • 41:39 A 101 on Disability Design Theories
  • 48:03 The NULU Knife – an example of adaptive design
  • 51:27 Helping incubate adaptive design ideas
  • 53:30 A discussion on “ADHD wiring”
  • 1:02:09 Intelligence, pattern recognition and AI
  • 1:08:20 AI in work and education
  • 1:14:41 Doug’s Future Plans
  • 1:18:34 Q&A Start
  • 1:18:53 What does innovation mean to you?
  • 1:19:17 Key Moment, Event, Person
  • 1:21:59 Time Management
  • 1:24:43 Favourite childhood memory
  • 1:27:02 Biggest challenge to date
  • 1:30:41 Advice for young professionals
  • 1:33:55 What would you most like to be remembered for?
  • 1:35:31 Where can people find you?
  • 1:37:07 Final Message
  • 1:37:41 Outro

Connect with Douglas Katz

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Credits